CN103539417B - Method for manufacturing steam-pressing bricks by using iron tailings and steel slag - Google Patents
Method for manufacturing steam-pressing bricks by using iron tailings and steel slag Download PDFInfo
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- CN103539417B CN103539417B CN201310469127.3A CN201310469127A CN103539417B CN 103539417 B CN103539417 B CN 103539417B CN 201310469127 A CN201310469127 A CN 201310469127A CN 103539417 B CN103539417 B CN 103539417B
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Abstract
The invention relates to a method for manufacturing steam-pressing bricks by using iron tailings and steel slag. The steam-pressing bricks are manufactured by adopting the following raw materials in parts by weight: 50-70 parts of iron tailings, 20-35 parts of steel slag powder, 5-20 parts of active admixture, 0.7-2 parts of special middle-temperature digesting agent, 1.5-3 parts of gypsum, 0.3-1 part of activator and 5.3-12.5 parts of water. The key of the method lies in that the steel slag is subjected to physical and chemical modification and activity stimulation, so that the stability and activity of the steel slag are improved. As the steel slag is a main binding material of the steam-pressing bricks prepared by the method and no cement and lime or calcium hydroxide are added, the production cost is low.
Description
Technical field
The present invention relates to a kind of autoclaved brick and utilize the method for iron tailings, prepared from steel slag autoclaved brick, be specially and replace cement or the obtained iron tailings autoclaved brick of lime and preparation method thereof with making major gelled material through the steel-making slag powder of modification, adulterant and auxiliary agent.
Background technology
China is mining industry and big steel country, and resource consumption is huge, and the quantity discharged of mine tailing and slag is also very huge.Only China's crude steel output in 2012 7.17 hundred million tons, produces 100,000,000 tons, slag.Whole nation mine tailing is piled up total amount and has been reached 8,000,000,000 tons.By region, composition, utilize the restriction of the various conditions such as technology, the utilization ratio of these two kinds of bulk solid waste is all lower.Therefore, produce a large amount of iron tailings and the accumulation of slag, easily cause air, soil and groundwater to pollute, cause ecological damage, even cause serious man made geologic hazard.Through years of researches, China has made some progress in the recycling of mine tailing, slag.Wherein, patent of invention CN1186782A provides a kind of technology utilizing mine tailing autoclaved brick, with the solidifying agent containing cement clinker for gelling material.The present invention carries out modification to slag, produces tailing autoclaved as major gelled material.
Slag is the waste residue produced in steelmaking process, and generate temperature high (more than 1600 DEG C), its chemical constitution (tricalcium silicate, Dicalcium Phosphate (Feed Grade)) is similar to cement clinker is a kind of material with lateral reactivity.But the free CaO containing a large amount of instability in slag, free FeO and free MgO, the complete aquation of these compositions needs experience long time and along with volumetric expansion, can cause the volume stability problem that building material made seriously ftractures when steel slag content is large.This is the major cause that restriction slag is widely applied in production of construction materials.Therefore, be badly in need of a kind for the treatment of process technology, improve the volume stability problem in production of construction materials process of slag.Meanwhile, by activity excitation technology, slag-mine tailing steam pressure process is strengthened, improve the mechanical strength of autoclaved brick.
Summary of the invention
The present invention is directed to the problem of stability difference when preparing that in autoclaved brick process, steel slag content is large, provide one to utilize iron tailings, slag for main raw, and the autoclaved brick of modified preparation and the preparation method of described autoclaved brick are carried out to slag.
For solving the problems of the technologies described above, the invention provides a kind of autoclaved brick and preparation method thereof.Concrete technical scheme of the present invention is:
A kind of autoclaved brick, is characterized in that: be made up of the component of following ratio of weight and number: iron tailings 50 ~ 70 parts, modified steel ground-slag 20.7 ~ 37 parts, active admixture 5 ~ 20 parts, 1.5 ~ 3 parts, gypsum, exciting agent 0.3 ~ 1 part; Wherein, the preparation method of described modified steel ground-slag is: after steel-making slag powder 20 ~ 35 parts, the special digestion agent of middle temperature 0.7 ~ 2 part and suitable quantity of water being mixed in proportion, send in autoclave, close still door, vacuumize, then steam is passed into, compound in autoclave at 70 ~ 90 DEG C of temperature modification take out after 15 ~ 20 hours, wherein water and other solid materials weight ratios (abbreviation ratio of water to material) are 0.04 ~ 0.06.
The parts by weight of above-mentioned modified steel ground-slag refer to dry material mass fraction.
In autoclaved brick of the present invention, in described iron tailings, dioxide-containing silica is 40 ~ 56%, maximum particle diameter≤2mm; Described steel-making slag powder obtains by making steel shrend slag grinding after broken, magnetic separation, and specific surface area is 380 ~ 500m
2/ kg, free calcium oxide content is 1 ~ 5%; Described active admixture is more than III grade flyash or slag powders; The special digestion agent of described middle temperature by weight ratio be the SODIUM PHOSPHATE, MONOBASIC of 1.5:0.5:0.5, sodium sulfate and calcium lignin sulphonate form; Described gypsum is desulfurated plaster or phosphogypsum; Described exciting agent is that the sodium aluminate of 8:2 and water glass form by weight ratio, and wherein, the modulus of described water glass is that the modulus of 1.0(water glass refers to SiO in water glass
2with Na
2the molar ratio of O).
The present invention also provides the preparation method of above-mentioned autoclaved brick, and described preparation method adopts the raw material of following ratio of weight and number: iron tailings 50 ~ 70 parts, steel-making slag powder 20 ~ 35 parts, active admixture 5 ~ 20 parts, the special digestion agent of middle temperature 0.7 ~ 2 part, 1.5 ~ 3 parts, gypsum, exciting agent 0.3 ~ 1 part, 5.3 ~ 12.5 parts, water; Described preparation method comprises following steps: steel-making slag powder, the special digestion agent of middle temperature and suitable quantity of water mix in proportion and make compound by (1), compound is sent in autoclave, close still door, vacuumize, then steam is passed into, compound is modification 15 ~ 20 hours at 70 ~ 90 DEG C of temperature in autoclave, modified taking-up modified steel ground-slag; (2) modified steel ground-slag and iron tailings, active admixture, gypsum, exciting agent and suitable quantity of water are mixed in proportion, stir, are pressed into adobe, after leaving standstill, under 180 DEG C of conditions, steam press maintenance makes autoclaved brick in 6 ~ 8 hours.
Preferably, for controlling slag modifying process better, above-mentioned preparation method, water and other solid materials weight ratios (abbreviation ratio of water to material) they are 0.04 ~ 0.06 in step (1), more preferably 0.05.
Preferably, for controlling autoclaved brick final product quality better, in above-mentioned preparation method, in step (2), the pressure of pressing unfired brick is 25 ~ 30MPa, water and other solid materials weight ratios (abbreviation ratio of water to material) they are 0.08 ~ 0.11 in step (2), more preferably 0.10.
Preferably, in autoclaved brick preparation method of the present invention, described iron tailings dioxide-containing silica is 40 ~ 56%, maximum particle diameter≤2mm.
Described steel-making slag powder obtains by making steel shrend slag grinding after broken, magnetic separation, and specific surface area is 380 ~ 500m
2/ kg, free calcium oxide content is 1 ~ 5%.
Described active admixture is more than III grade flyash or slag powders.
The described special digestion agent of middle temperature take SODIUM PHOSPHATE, MONOBASIC as main component, by weight ratio be the SODIUM PHOSPHATE, MONOBASIC of 1.5:0.5:0.5, sodium sulfate and calcium lignin sulphonate form, add the special digestion agent of middle temperature mainly in order to solve the bad problem of steel slag stability, the special digestion agent of middle temperature of the present invention, clears up at test proof is particularly useful for 70 ~ 90 DEG C.
Preferably, described gypsum is desulfurated plaster or phosphogypsum.
Described exciting agent is that the sodium aluminate of 8:2 and water glass form by weight ratio, and wherein, the modulus of described water glass is 1.0.
The steam used in step (1) can adopt autoclaved brick in preparation method's step (2) of the present invention to produce the exhaust steam of discharge, can reduce process costs further.
Beneficial effect of the present invention is: slag is through physics, chemical modification and activity excitation, its stability improves, active raising, solves a large amount of free CaO in common slag, free FeO and free MgO sharply expands in hydration process, cause the problem that autoclaved brick ftractures by the gross; By steaming pressuring curing process, make the active ingredient in slag and the silicon dioxde reaction in iron tailings, produce slag-tailing autoclaved.In autoclaved brick, slag replaces traditional cement and lime as major gelled material, reduces production cost, is conducive to environmental protection.The autoclaved brick obtained by present method, meets the MU10 strength grade of " autoclaved lime-sand brick " GB11945.
Embodiment
embodiment 1
1. slag modification
In 20 parts of steel-making slag powder, add warm special digestion agent and suitable quantity of water (ratio of water to material is 0.04) in 0.7 part, steel-slag mixture is incubated modifications 20 hours in 70 DEG C in autoclave.
2. autoclaved brick is produced
Proportioning: iron tailings 70 parts, modified steel scoria 20 parts, 18 parts, flyash, desulfurated plaster 1.5 parts, exciting agent 0.3 part, the total ratio of water to material of compound is 0.11.
Production technique: compound compression moulding under 30MPa after mix and blend, wheel Chan, adobe left standstill after 3 hours, and steam press maintenance makes autoclaved brick in 6 hours under 180 DEG C of conditions.Autoclaved brick meets the MU10 strength grade of " autoclaved lime-sand brick " GB11945.
embodiment 2
1. slag modification
In 30 parts of steel-making slag powder, add warm special digestion agent and suitable quantity of water (ratio of water to material is 0.05) in 1.5 parts stir, steel-slag mixture was 70 DEG C of insulation modifications 18 hours.
2. autoclaved brick is produced
Proportioning: iron tailings 60 parts, modified steel scoria 30 parts, 13 parts, flyash, phosphogypsum 2.2 parts, 0.6 part of exciting agent, the total ratio of water to material of compound is 0.10.
Production technique: compound compression moulding under 25MPa after mix and blend, wheel Chan, adobe left standstill after 4 hours, and steam press maintenance makes autoclaved brick in 7 hours under 180 DEG C of conditions.Autoclaved brick meets the MU10 strength grade of " autoclaved lime-sand brick " GB11945.
embodiment 3
1. slag modification
In 35 parts of steel-making slag powder, add warm special digestion agent and suitable quantity of water (ratio of water to material is 0.06) in 2 parts stir, steel-slag mixture was 90 DEG C of insulation modifications 15 hours.
2. autoclaved brick is produced
Proportioning: iron tailings 50 parts, modified steel scoria 35 parts, slag powders 7 parts, desulfurated plaster 2.6 parts, 1 part of exciting agent, the total ratio of water to material of compound is 0.08.
Production technique: compound compression moulding under 27MPa after mix and blend, wheel Chan, adobe left standstill after 4 hours, and steam press maintenance makes autoclaved brick in 8 hours under 180 DEG C of conditions.Autoclaved brick meets the MU10 strength grade of " autoclaved lime-sand brick " GB11945.
comparative example 1
(except slag non-modified, other operations are identical with embodiment 1)
Autoclaved brick production technique
Proportioning: iron tailings 70 parts, 20 parts, slag (non-modified), 18 parts, flyash, desulfurated plaster 1.5 parts, exciting agent 0.3 part, the total ratio of water to material of compound is 0.11.
Production technique: compound compression moulding under 30MPa after mix and blend, wheel Chan, adobe left standstill after 3 hours, and steam press maintenance makes autoclaved brick in 6 hours under 180 DEG C of conditions.Autoclaved brick meets the MU10 strength grade of " autoclaved lime-sand brick " GB11945.
comparative example 2
(except slag non-modified, other operations are identical with embodiment 2)
Autoclaved brick production technique
Proportioning: iron tailings 60 parts, 30 parts, slag (non-modified), 13 parts, flyash, phosphogypsum 2.2 parts, 0.6 part of exciting agent, the total ratio of water to material of compound is 0.10.
Production technique: compound compression moulding under 25MPa after mix and blend, wheel Chan, adobe left standstill after 4 hours, and steam press maintenance makes autoclaved brick in 7 hours under 180 DEG C of conditions.Autoclaved brick meets the MU10 strength grade of " autoclaved lime-sand brick " GB11945.
comparative example 3
(except slag non-modified, other operations are identical with embodiment 3)
Autoclaved brick production technique
Proportioning: iron tailings 50 parts, 35 parts, slag (non-modified), slag powders 7 parts, desulfurated plaster 2.6 parts, 1 part of exciting agent, the total ratio of water to material of compound is 0.08.
Production technique: compound compression moulding under 27MPa after mix and blend, wheel Chan, adobe left standstill after 4 hours, and steam press maintenance makes autoclaved brick in 8 hours under 180 DEG C of conditions.Autoclaved brick meets the MU10 strength grade of " autoclaved lime-sand brick " GB11945.
embodiment 4
To the autoclaved brick properties obtained by embodiment 1 ~ 3 and comparative example 1 ~ 3, measure according to relevant criterion, result is as follows:
Table 1 each embodiment autoclaved brick performance perameter
Conclusion: when common steel slag content is large, easily causes autoclaved brick to ftracture, and causes finished product by the gross to be scrapped, and the present invention adopts special process to carry out modification to slag, makes high additive slag be applied to autoclaved brick as gelling material and creates possibility.
Claims (9)
1. an autoclaved brick, is characterized in that: be made up of the component of following ratio of weight and number: iron tailings 50 ~ 70 parts, modified steel ground-slag 20.7 ~ 37 parts, active admixture 5 ~ 20 parts, 1.5 ~ 3 parts, gypsum, exciting agent 0.3 ~ 1 part; Wherein, the preparation method of described modified steel ground-slag is: after steel-making slag powder 20 ~ 35 parts, the special digestion agent of middle temperature 0.7 ~ 2 part and suitable quantity of water being mixed in proportion, send in autoclave, close still door, vacuumize, then steam is passed into, compound in autoclave at 70 ~ 90 DEG C of temperature modification take out after 15 ~ 20 hours, wherein the ratio of weight and the steel-making slag powder of water and the weight summation of the special digestion agent of middle temperature is 0.04 ~ 0.06;
In described iron tailings, dioxide-containing silica is 40 ~ 56%, maximum particle diameter≤2mm; Described steel-making slag powder obtains by making steel shrend slag grinding after broken, magnetic separation, and specific surface area is 380 ~ 500m
2/ kg, free calcium oxide content is 1 ~ 5%; Described active admixture is more than III grade flyash or slag powders; The special digestion agent of described middle temperature by weight ratio be the SODIUM PHOSPHATE, MONOBASIC of 1.5:0.5:0.5, sodium sulfate and calcium lignin sulphonate form; Described gypsum is desulfurated plaster or phosphogypsum; Described exciting agent is that the sodium aluminate of 8:2 and water glass form by weight ratio, and the modulus of water glass is 1.0.
2. the preparation method of autoclaved brick according to claim 1, is characterized in that: adopt the raw material of following ratio of weight and number: iron tailings 50 ~ 70 parts, steel-making slag powder 20 ~ 35 parts, active admixture 5 ~ 20 parts, the special digestion agent of middle temperature 0.7 ~ 2 part, 1.5 ~ 3 parts, gypsum, exciting agent 0.3 ~ 1 part, 5.3 ~ 12.5 parts, water; Described preparation method comprises following steps: steel-making slag powder, the special digestion agent of middle temperature and suitable quantity of water mix in proportion and make compound by (1), compound is sent in autoclave, close still door, vacuumize, then steam is passed into, compound is modification 15 ~ 20 hours at 70 ~ 90 DEG C of temperature in autoclave, modified taking-up modified steel ground-slag; (2) modified steel ground-slag and iron tailings, active admixture, gypsum, exciting agent and suitable quantity of water are mixed in proportion, stir, are pressed into adobe, after leaving standstill, under 180 DEG C of conditions, steam press maintenance makes autoclaved brick in 6 ~ 8 hours.
3. the preparation method of autoclaved brick according to claim 2, is characterized in that: in step (1), water and other solid materials weight ratios are 0.04 ~ 0.06.
4. the preparation method of autoclaved brick according to claim 2, is characterized in that: in step (2), the pressure of pressing unfired brick is 25 ~ 30MPa; In step (2), water and other solid materials weight ratios are 0.08 ~ 0.11.
5. the preparation method of the autoclaved brick according to Claims 2 or 3, is characterized in that: in described iron tailings, dioxide-containing silica is 40 ~ 56%, maximum particle diameter≤2mm; Described steel-making slag powder obtains by making steel shrend slag grinding after broken, magnetic separation, and specific surface area is 380 ~ 500m
2/ kg, free calcium oxide content is 1 ~ 5%.
6. the preparation method of the autoclaved brick according to Claims 2 or 3, is characterized in that: described active admixture is more than III grade flyash or slag powders.
7. the preparation method of the autoclaved brick according to Claims 2 or 3, is characterized in that: the special digestion agent of described middle temperature by weight ratio be the SODIUM PHOSPHATE, MONOBASIC of 1.5:0.5:0.5, sodium sulfate and calcium lignin sulphonate form.
8. the preparation method of the autoclaved brick according to Claims 2 or 3, is characterized in that: described gypsum is desulfurated plaster or phosphogypsum.
9. the preparation method of the autoclaved brick according to Claims 2 or 3, is characterized in that: described exciting agent is that the sodium aluminate of 8:2 and water glass form by weight ratio, and wherein the modulus of water glass is 1.0.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104692720B (en) * | 2015-02-02 | 2017-03-15 | 武汉市天沭科技发展有限公司 | A kind of copper tailing is non-burning brick and preparation method thereof |
| CN104844086A (en) * | 2015-04-25 | 2015-08-19 | 安徽阜阳富龙建筑材料有限责任公司 | Silicon-calcium slag autoclaved brick |
| CN104926254A (en) * | 2015-06-02 | 2015-09-23 | 马鞍山南山开发公司 | Method for producing autoclaved bricks from iron tailings |
| CN105236788A (en) * | 2015-09-09 | 2016-01-13 | 济南大学 | Additive agent suitable for calcium silicate board |
| CN105885587A (en) * | 2016-06-22 | 2016-08-24 | 杨玉双 | Anti-freezing waterproof coating and preparation method thereof |
| CN106348697A (en) * | 2016-08-26 | 2017-01-25 | 北海金匠水泥制品有限责任公司 | Preparation method of ore slag silicate cement brick |
| CN110317028A (en) * | 2019-08-20 | 2019-10-11 | 中冶南方都市环保工程技术股份有限公司 | A kind of non-autoclaved and unburned brick of iron tailings and preparation method thereof |
| CN111499329B (en) * | 2020-04-30 | 2022-06-07 | 安徽工业大学 | Autoclaved sand-lime brick containing steel slag tail mud and preparation method thereof |
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